RegExp to strip/remove HTML comments with PHP

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Are you just trying to remove the comments? How about

s/<!--[^>]*-->//g

or the slightly better (suggested by the questioner himself):

<!--(.*?)-->

But remember, HTML is not regular, so using regular expressions to parse it will lead you into a world of hurt when somebody throws bizarre edge cases at it.

Do not forget to consider conditional comments, as

<!--(.*?)-->

will remove them. Try this instead:

<!--[^\[](.*?)-->

This will also remove downlevel-revealed conditional comments, though.

EDIT:

This won't remove downlevel-revealed or downlevel-hidden comments.

<!--(?!<!)[^\[>].*?-->

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